What is the ultimate source of energy of almost any terrestrial (land) food chain or food web? what process converts this energy into a usable form?

Hey there!

Here are your answers:

1. The proper answer to this question is "the Sun".

Reason:

The Sun is the ultimate source of energy for organisms it allows plants to use photosynthesis to convert light energy into energy for that organisms and other organisms.

Therefore the answer is the Sun.

Here is your second

2. The proper answer to this question is "photosynthesis".

Reason:

Photosynthesis is the process that plants use to change (convert) light energy into energy (that other organisms can use). For example a apple tree uses photosynthesis to make apples for humans, and other organisms to consume for energy.

Therefore the answer is photosynthesis!

To sum up the answers are:
1.Sun
2.Photosynthesis

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit